All-Organic, Low Voltage, Transparent and Compliant Organic Field-Effect Transistor Fabricated by Means of Large-Area, Cost-Effective Techniques

Stefano Lai,Piero Cosseddu,Pier Carlo Ricci,Giulia Casula,Annalisa Bonfiglio

doi:10.3390/app10196656

Stefano Lai, Piero Cosseddu + Show 3 more

Open Access

https://doi.org/10.3390/app10196656

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Journal: Applied Sciences	Publication Date: Sep 23, 2020
Citations: 11	License type: CC BY 4.0

Affiliation: University of Cagliari, INFN Sezione di Cagliari

Abstract

The development of electronic devices with enhanced properties of transparency and conformability is of high interest for the development of novel applications in the field of bioelectronics and biomedical sensing. Here, a fabrication process for all organic Organic Field-Effect Transistors (OFETs) by means of large-area, cost-effective techniques such as inkjet printing and chemical vapor deposition is reported. The fabricated device can operate at low voltages (as high as 4 V) with ideal electronic characteristics, including low threshold voltage, relatively high mobility and low subthreshold voltages. The employment of organic materials such as Parylene C, PEDOT:PSS and 6,13-Bis(triisopropylsilylethynyl)pentacene (TIPS pentacene) helps to obtain highly transparent transistors, with a relative transmittance exceeding 80%. Interestingly enough, the proposed process can be reliably employed for OFET fabrication over different kind of substrates, ranging from transparent, flexible but relatively thick polyethylene terephthalate (PET) substrates to transparent, 700-nm-thick, compliant Parylene C films. OFETs fabricated on such sub-micrometrical substrates maintain their functionality after being transferred onto complex surfaces, such as human skin and wearable items. To this aim, the electrical and electromechanical stability of proposed devices will be discussed.

Highlights

Flexible organic electronics are considered a valuable technology for the development of innovative devices that can be complementary to those based on standard electronic processes
With respect to other devices reported in the literature, the low voltage operation and the sole employment of to other devices reported in the literature, the low voltage operation and the sole employment of large-area fabrication techniques, namely inkjet printing and chemical vapor deposition, can be large-area fabrication techniques, namely inkjet printing and chemical vapor deposition, can be highlighted
Enough, the same fabrication process can be applied to different kinds of highlighted

Summary

Introduction

Flexible organic electronics are considered a valuable technology for the development of innovative devices that can be complementary to those based on standard electronic processes. Overturning the standard paradigm of electronics, this peculiar technology emphasizes peculiar properties, such as flexibility and transparency, and the possibility of cost-effective fabrication over large areas All these features are of great importance for the future exploitation of flexible organic electronic devices in real products for electronic, optoelectronic and bioengineering applications: optical transparency is fundamental in different biochemical applications [1,2,3], and extreme flexibility is needed for the development of imperceptible, wearable and even tattoo-like devices [4,5,6,7,8,9,10,11]. Peculiar optical and mechanical properties must be

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